An earthquake with a preliminary magnitude of 5.7 struck off Iriomote Island, southwestern Japan on Thursday, the Japan Meteorological Agency (JMA) said.

The temblor was centred in the waters near Iriomote Island, southwestern Japan, with the epicentre at a latitude of 24.2 degrees north and a longitude of 123.8 degrees east and at a depth of 20 km, Xinhua news agency reported.